MAX1791

High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks


Please check latest availability status for a specific part variant.

Description

The MAX1762/MAX1791 PWM step-down controllers provide high efficiency, excellent transient response, and high DC output accuracy needed for stepping down, high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in notebook computers and PDAs.

Maxim's proprietary Quick-PWM™ pulse-width modulator is a free-running constant on-time type with input feed-forward. Its high operating frequency (300kHz) allows small external components to be utilized in PC board area-critical applications such as subnotebook computers and smart phones. PWM operation occurs at heavy loads, and automatic switchover to pulse-skipping operation occurs at lighter loads. The external high-side p-channel and low-side n-channel MOSFETs require no bootstrap components. The MAX1762/MAX1791 are simple, easy to compensate, and do not have the noise sensitivity of conventional fixed-frequency current-mode PWMs.

These devices achieve high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by their ability to drive synchronous-rectifier MOSFETs. The MAX1762/MAX1791 come in a 10-pin µMAX® package and offer two fixed voltages (Dual Mode™) for each device, 1.8V/2.5V/adj (MAX1762) and 3.3V/5.0V/adj (MAX1791).
MAX1762, MAX1791: Typical Operating Circuit MAX1762, MAX1791: Typical Operating Circuit Enlarge+

Key Features

  • High Operating Frequency (300kHz)
  • No Current-Sense Resistor
  • Accurate Current Limit
  • ±1% Total DC Error over Line and During Continuous Conduction
  • Dual Mode Fixed Output
    • 1.8V/2.5V/adj (MAX1762)
    • 3.3V/5.0V/adj (MAX1791)
  • 0.5V to 5.5V Output Adjust Range
  • 5V to 20V Input Range
  • Automatic Light-Load Pulse Skipping Operation
  • Free-Running On-Demand PWM
  • Foldback Mode™ UVLO
  • PFET/NFET Synchronous Buck
  • 4.65V at 25mA Linear Regulator Output
  • 5µA Shutdown Supply Current
  • 230µA Quiescent Supply Current
  • 10-Pin µMAX Package

Applications/Uses

  • 2-Way Pagers
  • Analog Cellular Phones
  • Digital Cellular Phones
  • Digital Still Cameras
  • Notebook Computers
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1762 5200.55.5
1.8
2.5
Preset
Resistor
2ExternalYes1300
µMAX/10
$2.18 @1k
MAX1791 
3.3
5
µMAX/10
$3.23 @1k
See All Step-Down Switching Regulators (362)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1791EVKIT: Evaluation Kit for the MAX1791, MAX1762

Quality and Environmental Data

Request Reliability Report for: MAX1791 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

Related Resources


MAX20049
Flexible Mini Dual 2.2MHz, 500mA Buck Converter with LDOs for Automotive Camera Supplies

  • Small Solution Size
  • EMI Solutions
  • Self-Protected and Robust

MAX17673
Integrated 4.5V to 60V Synchronous 1.5A HV Buck and Dual 2.7V to 5.5V, 1A Buck Regulators

  • Reduces External Components and Total Cost
  • Integrates Three DC-DC Regulators
  • Reduces Power Dissipation

MAX77813
High-Efficiency Buck-Boost Converter

  • VIN Range: 2.30V to 5.5V
  • VOUT Range: 2.60V to 5.14V
  • (I2C Programmable in 20mV Step)

MAX38643
Tiny 1.8V–5.5V Input, 330nA IQ, 700mA nanoPower Buck Converter

  • Extends Battery Life
  • Easy to Use – Addresses Popular Operation
  • Protects System in Multiple Use Cases

MAX38640
Tiny 1.8V–5.5V Input, 330nA IQ, 700mA nanoPower Buck Converter

  • Extends Battery Life
  • Easy to Use – Addresses Popular Operation
  • Protects System in Multiple Use Cases

MAX38641
Tiny 1.8V–5.5V Input, 330nA IQ, 700mA nanoPower Buck Converter

  • Extends Battery Life
  • Easy to Use – Addresses Popular Operation
  • Protects System in Multiple Use Cases

MAX38642
Tiny 1.8V–5.5V Input, 330nA IQ, 700mA nanoPower Buck Converter

  • Extends Battery Life
  • Easy to Use – Addresses Popular Operation
  • Protects System in Multiple Use Cases

MAX5995B
IEEE 802.3bt-Compliant, Powered Device Interface Controllers with Integrated 91W High-Power MOSFET

  • IEEE 802.3af/at/bt Compliant
  • Type 1~4 PSE Classification Indicator or an External Wall Adapter Indicator Output
  • Simplified Wall Adapter Interface

MAX5995C
IEEE 802.3bt-Compliant, Powered Device Interface Controllers with Integrated 91W High-Power MOSFET

  • IEEE 802.3af/at/bt Compliant
  • Type 1~4 PSE Classification Indicator or an External Wall Adapter Indicator Output
  • Simplified Wall Adapter Interface

MAX5995A
IEEE 802.3bt-Compliant, Powered Device Interface Controllers with Integrated 91W High-Power MOSFET

  • IEEE 802.3af/at/bt Compliant
  • Type 1~4 PSE Classification Indicator or an External Wall Adapter Indicator Output
  • Simplified Wall Adapter Interface

MAX38903B
1.7V—5.5VIN, 1A Low Noise LDO Linear Regulators in TDFN and WLP

  • 1.7V to 5.5V Input Voltage Range
  • 0.6V to 5.3V Programmable Output Voltage
  • 7µVRMS Output Noise, 10Hz to 100kHz

MAX38903C
1.7V—5.5VIN, 1A Low Noise LDO Linear Regulators in TDFN and WLP

  • 1.7V to 5.5V Input Voltage Range
  • 0.6V to 5.3V Programmable Output Voltage
  • 7µVRMS Output Noise, 10Hz to 100kHz

MAX38903D
1.7V—5.5VIN, 1A Low Noise LDO Linear Regulators in TDFN and WLP

  • 1.7V to 5.5V Input Voltage Range
  • 0.6V to 5.3V Programmable Output Voltage
  • 7µVRMS Output Noise, 10Hz to 100kHz

MAX38903A
1.7V—5.5VIN, 1A Low Noise LDO Linear Regulators in TDFN and WLP

  • 1.7V to 5.5V Input Voltage Range
  • 0.6V to 5.3V Programmable Output Voltage
  • 7µVRMS Output Noise, 10Hz to 100kHz

MAX20004
36V, 220kHz to 2.2MHz, 4A/6A/8A Fully Integrated Step-Down Converters

  • Multiple Functions for Small Size
  • High Precision
  • Robust for the Automotive Environment

MAX20006
36V, 220kHz to 2.2MHz, 4A/6A/8A Fully Integrated Step-Down Converters

  • Multiple Functions for Small Size
  • High Precision
  • Robust for the Automotive Environment

MAX20008
36V, 220kHz to 2.2MHz, 4A/6A/8A Fully Integrated Step-Down Converters

  • Multiple Functions for Small Size
  • High Precision
  • Robust for the Automotive Environment

MAX20077EVKIT
Evaluation Kit for the MAX20077

  • 3.5V to 36V Input Supply Range
  • 5V or 3.3V Fixed Output Voltage, or Adjustable Between 1V and 10V
  • Delivers Up to 2.5A Output Current

MAX25277
36V, 2.5A Mini Buck Converter with 3.5uA IQ

  • Synchronous DC-DC Converter with Integrated FETs
  • Small Solution Size Saves Space
  • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing

MAX20077
36V, 2.5A Mini Buck Converter with 3.5uA IQ

  • Synchronous DC-DC Converter with Integrated FETs
  • Small Solution Size Saves Space
  • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing

MAX77503
14V Input, 1.5A High-Efficiency Buck Converter with 9μA IQ

  • 1.5A Single Channel Buck Regulator
  • 3V to 14V Input Voltage Range
  • 0.8V to 99%VSUP Output Voltage Range

MAX17271
nanoPower Triple/Dual-Output, Single-Inductor, Multiple-Output (SIMO) Buck-Boost Regulator

  • 3-Output/2-Output, Single-Inductor, Multiple-Output (SIMO) Buck-Boost Regulator
  • 2.7V to 5.5V Input Voltage Range
  • Low-Power and Long Battery Life

MAX17270
nanoPower Triple/Dual-Output, Single-Inductor, Multiple-Output (SIMO) Buck-Boost Regulator

  • 3-Output/2-Output, Single-Inductor, Multiple-Output (SIMO) Buck-Boost Regulator
  • 2.7V to 5.5V Input Voltage Range
  • Low-Power and Long Battery Life

MAXM17900
4V to 24V, 100mA, Compact Step-Down Power Module

  • Easy to Use
  • High Efficiency
  • Flexible Design

MAXM17552
4V to 60V, 100mA, Compact Step-Down Power Module

  • Easy to Use
  • High Efficiency
  • Flexible Design

MAX38888
2.5V–5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications

  • 2.5V to 5V System Output Voltage
  • 0.8V to 4.5V Cap Voltage Range
  • Up to 2.5A Peak Inductor Discharge Current

MAX17250
2.7V to 18V Input, Boost Converter with 0.1uA True Shutdown, Short Circuit Protection and Selectable Input Current Limit

  • Input Voltage Range 2.7V to 18V
  • Output Voltage Range 3V to 18V, > VIN
  • Integrated Power FETs

MAX17671
Integrated 4V-60V, 150mA, High-Efficiency, Synchronous Step-Down DC-DC Converter with 50mA Linear Regulator

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX17672
Integrated 4V-60V, 150mA, High-Efficiency, Synchronous Step-Down DC-DC Converter with 50mA Linear Regulator

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX17670
Integrated 4V-60V, 150mA, High-Efficiency, Synchronous Step-Down DC-DC Converter with 50mA Linear Regulator

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX20098
Versatile 36V 2.2MHz Buck Controller with 3.5µA IQ

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
  • Enables Crank-Ready Designs
  • EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input Voltage Range

MAX17633
4.5V to 36V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAXM17903
4.5V to 24V, 300mA Compact Step-Down Power Module

  • Easy to use
  • High Efficiency
  • Flexible Design

MAXM15064
4.5V to 60V, 300mA Compact Step-Down Power Module

  • Easy to use
  • High Efficiency
  • Flexible Design

MAX77680
3-Output SIMO Buck-Boost Regulator with Power Sequencer and 3μA IQ

  • Single-Inductor, Multiple-Output (SIMO) Extends Battery Life
  • Compact, High-Efficiency Power Solution
  • Small Size

MAX77681
3-Output SIMO Buck-Boost Regulator with Power Sequencer and 3μA IQ

  • Single-Inductor, Multiple-Output (SIMO) Extends Battery Life
  • Compact, High-Efficiency Power Solution
  • Small Size

MAX20416
2.2MHz Dual-Output, Low-Voltage Step-Down Converters

  • Multiple Functions for Small Size
  • High Precision
  • Robust for the Automotive Environment